cisco test papers

cisco test papers

Tunnel mpls traffic-eng autoroute announce R1 advertisement Loopback route .1.1.1.1 / 32 State: Oper; Msgs sent/rcvd: 13/13; Downstream Up time: 00:03:47 = 250000 bytes/sec Switched In the IGP (such as OSPF or ISIS configuration) of the routing process. This command sets the TE router 's routerID 75000 If the link or node fails, the traffic will be rerouted due to the failure. If the rerouting takes a few seconds, the high performance of the link will cause a large amount of traffic pointing to the fault point to be discarded. For some businesses, business interruption may result. Mpls traffic-eng tunnels ip rsvp bandwidth Message format Only the label mapping message of the route prefix advertised by the next hop neighbor of the optimal route is saved locally. SSN : Mainly used in the following two aspects: *Aug 18 09:06:07.919: Path MTU: 1500 Ip cef i ia 5.5.5.0 [115/158] via 10.1.123.2, FastEthernet0/0 10.0.0.0/24 is subnetted, 4 subnets Priority 4 : 9375000 Verify view The configuration of R3 is as follows: Ip vrf forwarding VPN-A Test . 4 : SET 'bit-overload-the suppress External Mpls ip Mpls traffic-eng tunnels ip rsvp bandwidth Ip router isis ! 1.0.0.0 0x2B7C Network 10.1.45.5 0.0.0.0 area 0 The TE LSP tunnel is initiated by the head end of the tunnel. ! Router-id 2.2.2.2 Untag : Pops up all the tags and then forwards them according to the next hop (find FIB table). There are three reasons for the occurrence of untag : LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL The distribution of the label is like this: Show mpls traffic-eng link-management advertisement MPLS is a CISCO proprietary protocol, later IETF borrowed, in IETF is called Tag Switching , can be understood as both a different name when enabled, the protocol used is not the same Neighbor 5.5.5.5 update-source Loopback0 10.1.12.2 The configuration of R1 is as follows: 75M Router isis Path establishment and maintenance For example, in the above topology, R1 establish a to R4 of TE the Tunnel , all routers have declared their loopback into OSPF . All interfaces cost are 1 . *Aug 18 09:06:07.919: 10.1.23.3 Link ID:: 1 10.1.12.2 4.4.4.0/24 ! Interface Serial0/0 *Aug 18 09:06:02.699: Path Latency (microseconds):0 Interface eth0/0 Refresh Period (msec): 30000 Network 10.1.24.2 0.0.0.0 area 0 *Aug 18 09:06:02.699: Tun Dest: 5.5.5.5 Tun ID: 0 Ext Tun ID: 1.1.1.1 Interface Tunnel0 IS-IS Level-1 LSP R1.00-00 R2.00-00 *Aug 18 09:06:07.919: Such as PPP , HDLC Imagine if AB link between carrying a lot of the Tunnel , then when this root link DOWN out of time, will likely trigger a large amount in a short time PATHtear and ResvTear , so how to optimize it? Traffic engineering ( Traffic Engineering ) we can be loosely understood as "the ability to control traffic across the network," we can by TE allows the deployment of traffic in an optimal way transmission from one node to another node in the network. O 10.1.34.0 [110/3] via 10.1.12.2, 00:00:39, FastEthernet0/0 There have been a lot of talks about ATT-bit before, so I won't be embarrassed here. I have tested on CISCO IOS Version 12.4(10) -- C3640-JK9O3S-M . On R1, which is L1 router , with default-information originate , I can't generate default route. Interface Serial0/1 Length of Value R1 is based on the remaining two paths, then compare TE metric (default is equal to IGP Metric ) Tspec parameter id = 127, flags = 0, length = 5 16 Mpls traffic-eng tunnels ip rsvp bandwidth *Aug 18 09:06:07.919: General Parameters break bit=0 service length=8 AutoRoute *Mar 1 00:00:32.759: ISIS-Upd: full SPF required Or Tunnel Id Or ISIS will flood the LSP . Send PATH message to the downstream every 30S head end Path Protection Label description I don't want L1-router to generate this default route,cisco test papers, or more rigorously, we don't want L1\L2 router to press att , the method is Outgoing tag or VC Version=0, length in words=7 Mpls ldp igp sync holddown 5000 Impact of route summarization on MPLS Tun Sender: 1.1.1.1, LSP ID: 521 The router that determines which FEC the message belongs to is the inbound LSR because it classifies and pushes the message into the label. Router-id 2.2.2.2 Fa1/0 Pop tag Tunnel mpls traffic-eng path-option 10 dynamic R1#show mpls ldp neighbor MPLS design and implementation Do as shown in the F0/0 and Fa1/0 ports of R3 . In this way, even if the source destination address is unchanged, R3 will be at F0/0 and F1/0. i L1 2.2.2.0 [115/10] via 10.1.123.2, FastEthernet0/0 5.0.0.0/24 is subnetted, 1 subnets (Tunnel0) Destination: 4.4.4.4 The link state database of TEDB and IGP is independent. R1#sh mpls ldp discovery Local LDP Identifier: POP is the TTL of the top-level tag minus 1 and then pops up. The new TTL value is written to the top-level tag of the outbound data. Rl , R2 , R3 , R4 running the OSPF , declaring a straight connector, and Loopback interfaces, Loopback port IP of XXXX / 32 , X No output feature configured Outgoing The SNPA address can be obtained in several ways: Network 3.3.3.3 0.0.0.0 area 0 Label or VC Device Internet segment 10.1.xy.0 / 24 , where xy is the device number, X small y large 104 6bits IS-IS packet format Bandwidth information The LFIB table does not contain inbound interface information. 17 Pay attention to the distinction between autoroute and here . The autoroute feature is not activated in our configuration above . Autoroute feature and autoroute 75000 Ip unnumbered Loopback0 Router ospf 1 Interface Ethernet0/0 The routing table for R1 is as follows: 10.1.12.2 Interface eth0/1 Ip router isis Interface eth 0/0 Type 1 length 12: Network 10.1.12.1 0.0.0.0 area 0 Remote binding: tsr: 2.2.2.2:0, tag: imp-null Using domain authentication, IIH packet, CSNP , PSNP is not carrying authentication information, LSP is used to carry the authentication TLV . * Aug 18 04: 37: 06.239 : Outgoing PathTear: !! dismantle tunnel IGP metric: 1 Protect lsp path: 10.1.12.1 10.1.12.2 Interface eth0/1 O On the point-to-point link, the neighbor uses PSNP to acknowledge the new LSP . When the source router receives the PSNP acknowledgement sent by the neighbor , it stops sending new LSPs to this neighbor . In the LAN , there is no clear PSNP confirmation. The lost LSP can be detected. If any of the LSP missing or expired, Router are to PSNP send a request form to request retransmission of the LSP .